Help us shape the future of Go! Take the 2026 Go Developer Survey

Why Go
- Case Studies
  
  Common problems companies solve with Go
- Use Cases
  
  Stories about how and why companies use Go
- Security
  
  How Go can help keep you secure by default
Learn
Docs
- Effective Go
  
  Tips for writing clear, performant, and idiomatic Go code
- Go User Manual
  
  A complete introduction to building software with Go
- Standard library
  
  Reference documentation for Go's standard library
- Release Notes
  
  Learn what's new in each Go release
- API
  
  Reference documentation for the pkg.go.dev API
Packages
Community
- Recorded Talks
  
  Videos from prior events
- Meetups
  
  Meet other local Go developers
- Conferences
  
  Learn and network with Go developers from around the world
- Go blog
  
  The Go project's official blog.
- Go project
  
  Get help and stay informed from Go
- Get connected

assay

package module

Go to main page

Versions in this module

v1

v1.0.0

Aug 4, 2026

v0

v0.6.3

Aug 4, 2026

v0.6.2

Aug 4, 2026

Changes in this version

type Config

+ FlushTimeout time.Duration

type SamplerStats

+ RejectedSamples uint64

v0.6.1

Aug 3, 2026

v0.6.0

Aug 3, 2026

Changes in this version

type Sampler

+ func (s *Sampler) Stats() SamplerStats

+ type SamplerStats struct

+ ActiveSchemas int64

+ DroppedSamples uint64

+ FlushFailures uint64

+ FlushSuccesses uint64

+ IngestedSamples uint64

v0.5.2

Aug 3, 2026

v0.5.1

Aug 3, 2026

v0.5.0

Aug 3, 2026

Changes in this version

+ var ErrClosed = errors.New("assay: sampler is closed")

type Config

+ OnError func(error)

v0.4.3

Aug 3, 2026

Changes in this version

+ const Version

v0.4.2

Aug 3, 2026

v0.4.1

Aug 3, 2026

v0.4.0

Aug 3, 2026

Changes in this version

type Sampler

+ func (s *Sampler) Flush()

v0.3.0

Aug 3, 2026

Changes in this version

+ var ErrMaxSchemasExceeded = errors.New("maximum schema count exceeded")

type Config

+ MaxSchemas int

v0.2.4

Aug 3, 2026

Changes in this version

type Config

+ MaxArrayElements int

v0.2.3

Aug 2, 2026

v0.2.2

Aug 2, 2026

v0.2.1

Aug 2, 2026

v0.2.0

Aug 2, 2026

Changes in this version

type Sampler

+ func (s *Sampler) DeleteSchema(ctx context.Context, schemaID string) error

type StatsBackend

+ Delete func(ctx context.Context, key string) error

v0.1.5

Aug 2, 2026

v0.1.4

Aug 2, 2026

v0.1.3

Aug 2, 2026

v0.1.2

Aug 2, 2026

v0.1.1

Aug 2, 2026

v0.1.0

Aug 2, 2026

Changes in this version

+ var ErrMaxDepthExceeded = errors.New("maximum JSON nesting depth exceeded")

+ type Config struct

+ FlushInterval time.Duration

+ MaxDepth int

+ MaxPaths int

+ type DataType int

+ const TypeArray

+ const TypeBoolean

+ const TypeNull

+ const TypeNumber

+ const TypeObject

+ const TypeString

+ func (d DataType) String() string

+ type PathStatsSnapshot struct

+ ObservedCount uint64

+ TypeCounts [6]uint64

+ type PathUpdate struct

+ Count uint64

+ Path string

+ Type DataType

+ type Sampler struct

+ func NewSampler(backend StatsBackend, cfg Config) *Sampler

+ func (s *Sampler) Close() error

+ func (s *Sampler) GetSchema(ctx context.Context, schemaID string) (*SchemaNode, error)

+ func (s *Sampler) Sample(ctx context.Context, schemaID string, payload any) error

+ type SchemaNode struct

+ Children map[string]*SchemaNode

+ Name string

+ Path string

+ Probability map[string]float64

+ Required bool

+ Type string

+ type StatsBackend interface

+ MapGetAll func(ctx context.Context, key string) (map[string]string, error)

+ MapIncrementBy func(ctx context.Context, key, field string, delta float64) (float64, error)